Despite the fact that much of what the ancient Egyptians wrote has been lost, there's such a large surviving amount that stuff has gotten missed. For example, King Tut (cue the music) had a major colonnade built at (if memory serves) Karnak temple, but Ramses, in his lifelong quest to take credit for earlier work, had his cartouches carved in over those of Tut. Luckily, the temple used to have a roof and the columns are very tall, and one or more of Tut's cartouches up near the darkness of the ceiling was missed or deliberately skipped and have survived. Ramses II also had at least one colossal head of (if memory serves) one of the Middle Kingdom pharaohs, Sesostris, altered to resemble his own face.
The whole concept really blossoms when you check the street view for the "Egyptian Obelisk In Paris" that is the subject of this very article.
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